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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f345f718b09261d14a9bbd5d02be75f2ed0525313177072085e73a399db0693' 
  AND token = '9e1mkAg02z8ZD5zsqF+pZHFn4+tWku0giLURqzncHs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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