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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd217fc222cf575208ec94e8354376131131df0f5af8368a4b89eeadc968c93e3' 
  AND token = '1t9w0zNB1P1tFtKZQD0NVRhzKkGbcAcuwncGJ2MuLOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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