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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd3e872e439f61719bd0ba7ee3a37c627db00cefadb7c7dd807c3fedb8be990c' 
  AND token = 'F9xwa9hgRMdtTNNxsa1Dom9dgUirBojc9cq5v0MIMAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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