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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5acc6e9b53bae8f57674b17aa9c321074ab203e5d8957be28b7f4a078667f3c1' 
  AND token = 'n2/pz8hZp0gDifCjGbuNZ/yItkJER8BsXmEz23I8/nc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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