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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1302cad4b7c47aff96d0264524d60726619ca46bf18d70dec83a31d5ba5d2167' 
  AND token = 'q0sKK/asBswb7SC9wud63oZfLcCp1F9mSHO5PLsYTOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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