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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b2fbda8e0bf69f3cc4af17286aea76dc1e617c7d671e0e472d2edeef8e8e76a' 
  AND token = 'nTplRyRqtytvcaw+8iFhg+2Qv9AX/Cq0WAVRUJDvIo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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