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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd94cff44f7f99f10c3d9537cad47e11617302ae6a304c412d00a4c1564a000e0' 
  AND token = 'bnUcyYe1XTF9aDppFiRZPUEIDvN399TNh03gUEc6HXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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