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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4f5d3052c12f8b2dde7649e21bdaadb2c280e8350053d068aba6954279c1b29' 
  AND token = 'cirkkKC6MAnrfLaHdur6XCkowKY8eFdzk44ox7Zyi2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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