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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e844daebf32a4f6c2c6b158b4055c2551d3c9547113b8ee759b0b580c18b953f' 
  AND token = 'c+dErEOgoRrFsBXy82iHBxroqauh8xkZ45P/r6li4wY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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