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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f59a3573c16b8e416482d88a46afe81b51bcdc0217150ba5eccd3945bf3c04db' 
  AND token = 'ttfqxEdFvwaQqq7xLtXLxIAnngRlpJp15TYcH19Zq9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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