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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fab03a351211dcf866269fab4b15365f5e4a17f099e9a745d5e207770b037db7' 
  AND token = 'Pcz/AUyVeBhhM29m1YUx3qakZuJrVO6V92utbhN6hCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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