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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8e5ba51486745e91e4d6d94e2b2b8a8efe754c9b29071291c009a17104ce59c' 
  AND token = '6JfKy3QdDjxxGbBm2FOCznEHf4FM6/QDagQI2jZ4fzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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