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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c4e65be68df00539415e93671660bb5aaf7d6a1567b54cbee9d385f43fb45df' 
  AND token = 'ZDm0H8tqZYoP1tLIQmW+zfsB8SE0R3wyUO5W2c23VoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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