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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c62db428d7776a96a952587d1b7d3b76852b2d10bda2a1158509ddf8aa58fb7a' 
  AND token = 'tCLE7C/11VtYrBwu/gU3LQc9AEPMV7BQkQ/rkgNm1VM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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