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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a519a5a7c48d19e6f4f236c0aeba32b4e00c5a1b1c4ff78b8f58811d6078f8d4' 
  AND token = 'CvzldNWR3JAxvmLxweVaHpvokrbIijfH5GMT82M29hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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