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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a03e6f8c84fe0f03fa4e1de2a7d8973bcdc67207e052e397671407b957aa2a7f' 
  AND token = 'tXHw+ym4egPXiAB2/PyWr1RvSB/FPk4pKdgl0ozjYIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}