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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03a3432c7197564c0613ea90b248505417ce74cac4e29aa08a0717cafa05c9cf' 
  AND token = 'X8ymPMpYtwISu/fvEVv8w/FTxfUxXgoWvtjnksO4uFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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