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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b85b194bee8579d1aaad4af2d37223cc67a2963ae93e8872ea559dfd863394f' 
  AND token = '1R6iTCInhZIvbIM/a1Y9k9Z//cF43T34wOEJca/MWIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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