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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd62624ab3aabfc91ea10d9941331d37f70d67a04289891b9ac19044964e31881' 
  AND token = '5rLul1wRCJjBHpv/MJGmxT5tt/Ara6ZrWg4nSRO4SjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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