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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e9de755a872a0dcc6858c8b847b8a95bd28df8f4f7428c6469681cea7cf1b43' 
  AND token = 'R8QIRhBzv0dbzE27HPCw33jOdW5nrlRSUaaPV5SVr14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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