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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd857f9e1ff1d932da21a5d392c10bb90bb3069af4914bd719c341e1fef510d0a' 
  AND token = '7g3LYYlyucj6tL5jnsApAm4TdUYyahQnJNwNKPPMreg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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