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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecf1d84680037c63083b17981c30f33b9a8a8667b62f2cd3161bb337a02dcb9f' 
  AND token = 'XY87bLPcZRpYVTEHcX1tVqmnVIuV/cBolaQe5WgqLPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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