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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24006abfaae54b31814748e4f4021a13ce40ee27c6c55bf33fedbdd0ff1ef214' 
  AND token = 'o00lyAabf9bzfxKeKk9Q4wScgiqrz72CAj++Db+dZag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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