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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb3af450e13853b9453c03cb360276a5e5588f6e07c410a1829982e82296813a' 
  AND token = 'lBp5I791lxyWmi7QuxyUx4WORNTiHRMCC9j7oLf+Ft0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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