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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf64af529f30344cb747ba38db209ddd60e116da992d2594afd4011413250163' 
  AND token = 'm6jNkGik36a569YnwiiJJPhVB1I/VNsknLjt1EHYmqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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