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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '349da8cd95344227dd80d7de75c77ec154ba0f4e8de156bb08dd69507f480f69' 
  AND token = 'aT74et6eQ/CTnP98yah4wdbck1lSAuHG6mzcj3pBrPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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