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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08a61cd31177ac5402c55b67f6f944a1198ad891dbac54489ec2b15b47776417' 
  AND token = 'NLfucb653NyXADKnVPkt4aWQxdBjkWKo94703kIKpF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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