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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a878ef1481b81ee0dae541333d7b99b91003464f9e0566bb9f552e1875f24a1' 
  AND token = 'I4V8nxsbJGP7j9lZUzi2DTrz2Y6NN594y+TV67DfJVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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