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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7500f6320b317e9e5f799e4916d4568fe7c25b7bf31208d94c27d0bd3115769' 
  AND token = 'RiqTlDDnQR7Bi5AREQ5Il/KkhBXMesFdxTgm/daparI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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