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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6067bdf3bb361be1a55a21f08f0446c80560c57ab880639c5de0f0ec2d5040b6' 
  AND token = 'Tche41b3o4rX/7svCSDMQqyTcL6PXgmYNZyEmuSCKPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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