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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46a1798f6fd23277e96864a0a6f21b122004a8a0c8c55eed8491615a0c2a4ea5' 
  AND token = 'TOlE/q8EHUTeNzatJUxvSQHoYAKZll0neq/2VvUlxxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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