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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f59a73bf6a057647aaedaa8c0370d2eefa4eb6ced5e7d010e8868962c9eb71a9' 
  AND token = 'j0p0Kx5ym3OOa7Xbtr7bjxfbnwMfCfRwBSyiTl9B9W4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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