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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aec2a726d38c373275980156a7ab0ac67dab67827d52653a93fb801f105042c8' 
  AND token = '/UO9eD1BG/ZTyCxNP+0eX5PpbmulGGvgaSfBD6tBnT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00087

JSON explain

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