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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cff9be74b9e25f0ca1d0e4e5b7e4758f01bb27b855c423f6b3038473a81500c9' 
  AND token = 'yo6uN1DrXvzxMxlKoW9A/z2/trqYueWtmEU/0KsOjQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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