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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '481b0a9cdb1ac20307553784a7fb6c5572b9cd6985b9b25446296605806caf1a' 
  AND token = 'gnqckt3X6p8yFPrNTpkzlQmUU7PrGqd98dQ7CQ9SY9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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