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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '974b5c81ebfa0923f74a2bee742c728c80c83f18723b810834d1a404dcdf0d1f' 
  AND token = '2FZe5FSXMcLLAQFDa4e2A+aeoKHwc6UX7EDdD7FUu1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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