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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '868ac3a771c148c93d3ae8cbf6b97b895549547e580aac9db75030a423d7a785' 
  AND token = '990S4IfpbPCM/6pmfIFCgkA+9Kgp14Tfl91KIdcQG84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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