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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e9d0f9cb4898183399280216ce28668d7ee2d45c10c712e94a76351ef6897eb' 
  AND token = 'puCdJdVfnaQwYQGMPrfFmKp2ApOPjg0e926xtTLLJ7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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