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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2aad16b0d94faa9f9ffd3e2f5238a68b8cac8bef8b3f0547bc8cce0b0df14c1b' 
  AND token = 'yBjndBmJoBq4pNKHBegkbb5FPzfVxwu4LN5p/+6tsvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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