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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d441bbc0ed26e5aa0a60423d7f7e29b70333f34cf22d1f07a91b22cfe51d3b7' 
  AND token = 'IopyOSTndLqWvOuMWqdg+w/+wmpFObYusBM7iLze+Sw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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