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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08bcac5b0f75b3c41e8469f6e83f3b85b05c193f9e6c4c4cbdb11a1bb9c8bacd' 
  AND token = 'Y9lwNOOhyi+PCsiemf0Tv7UFhb0k7v30lFWAHdT93+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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