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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77c79c1e1e125a584c4ac7a8fec2f8a1c0d452b64ae6101c5f0c254f0a42c61a' 
  AND token = 'wZEKVgXenF7TtIVbO3DAlrS075ZnOu5NijQDI5caXSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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