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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9f0a0f9dbb8521467e32e1ec2b8ac1803b5cecf3d6b565ba12f0f9dc77aef9f' 
  AND token = 'Eil97cgjJk0lc8TWztCQFvyjNjofOqHCyyjzQeKapnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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