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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcfbe192cec564b2393523d7421445469990634e5d0769d7885aa9d292ac2391' 
  AND token = 'oJ6rlfkykqLjj6weko0coTBCuNDmPhxusUDNZiit9CU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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