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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85c0eec157efb43d97d8fd9133bb3d1320f7d3d2c2c6a6b790486fb0e37b35a0' 
  AND token = 'QBmgHrF5ED2mycw6B9ClngWcp9bSNCW+S3+z1SNNkwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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