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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ec32895ac3cea01c0b97418899b49d60cb448dcfa30e1f7b22198cd7c847ef6' 
  AND token = 'gJRbr00o6Tz4JuIeXPy3HOi2pfaSyEbPUMfAZmrUDFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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