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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1de6fb386e17e2354823ac03487ab0cc53e331144771ff8189f7d41c8c869a9a' 
  AND token = 'W+BgdPqSfH/JTlT3QC0stt6q68VTA4xE+H5+WE48U9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00161

JSON explain

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