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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c431ac0976efcec9d1f49e3cfd03090a5d7709fec6b8f2890ef3e73f894d1aa1' 
  AND token = '1YnUIz4f+TDkFLgB1wJhKHEmhd20Hdxo0etdu+ko84Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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