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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a679cbd8e412b2a0af34f55329042c0e481b51fa17b38c0a5caa68720f702b2b' 
  AND token = 'd2vsbc1KP6Lo7aqIhxTF68qr/pj6gx8yq1nGKT1XHIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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