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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eed767568fbab012df6dddd56329cafbf53abea5df0b045d4b7cd2387ce89ba2' 
  AND token = 'X0PAWy4ma0senOHd4sVjN1s32N8tjwQsAMyb7o/v9FQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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