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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6a7aeeb2c5b2fca3df246928c7e26d0968a2a2bed5d5190078e8739bcb951a8' 
  AND token = 'SsSuLbFMWuZMLe1LzfWmkrY0M3XC4SANon5VQ/3hPI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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