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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '131f104d55ae5a97f6886e299eebda23fcb65d4c9de6e175fa450715292c057f' 
  AND token = 'XognHwW2xnkLNh4OTrBJVwYqErhKgNZ3AnxN4UqX95k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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