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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeca86ae0647ccb927a6846e4c6ccf0ab78b29f79c7fb9345b95ba9776e3ec5c' 
  AND token = 'Aok80kGjeVlRaOQNloGPQQL1s9zBQgaByl2E7CR0Zhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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