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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f69bc1ab2eb511b238d1dd610f43e7aced9de1a088f577f6e86c6b0fd946e908' 
  AND token = 'oK4ucJJ3KIKJ25D/jiIZ5pGHRV4s8NcX1kLCZRJYP0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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