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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02a262f1bc5d7bdb3bf195464d91e009f77d8a47c0d2765197fada2c535324c7' 
  AND token = 'frTlf+sgdS6mrWJmciA8gst1bOhoe6lnCFP6jMcBhKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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