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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8282424ab7875d4de605ce3059083e368dea47b56b2538d14c188d02640e0b7b' 
  AND token = 'W6/lfTwvrVnb3oGXMAf0nblhxrWTiQYlkP8wY4q09Ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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