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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec97b4782b1243b7c3e520c4a41e3b0c03ae9f7a4b6c7579a960833875a7de91' 
  AND token = 'NvjKKQB05LPjibfEnSCZRajk5xXeu2cDyAuR0w4fGPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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