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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc65ba2ca1e2349f0600173d0799ed740cbf0f4851b17cd251f9e6bc4ec9bc36' 
  AND token = 'rCN1Hf4F4mm7nT54GO5lTUFdk5ayooxVPzf2cy5o/Nk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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